Mercury vapor light base for exterior lighting fixture



FIG. 1 is a top isometric view of a mercury vapor light base for exterior lighting fixture showing my new design;

FIG. 2 is a bottom isometric view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a back elevational view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a side elevational view thereof with other elements of a mercury vapor light shown in phantom for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for a mercury vapor light base for exterior lighting fixture, as shown and described. 